What is the author's style in The Spy Who Came in from the Cold by John le Carre?

The novel is told in chronological time order with the exception of some flashbacks to explain what has happened to Liz while Leamas is being interrogated. The story takes place over several months, though most of the action is concentrated on only a few weeks during which Leamas is interrogated and then testified for the Tribunal. Once this phase of the story begins, the events unfold very quickly.